کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
645624 | 1457147 | 2015 | 9 صفحه PDF | دانلود رایگان |
• A cell model for the ash-side heat transfer behavior in the FBHE was developed.
• Ash-side heat transfer coefficient profile along ash flow direction in FBHE was obtained.
• The 3rd and 4th tube panels of chamber II had the highest outer wall temperature.
On the basis of measurements on the fluidized bed heat exchanger (FBHE) of a 300 MW lean-coal-fired circulating fluidized bed (CFB) boiler under different thermal loads and numerical calculation for steam mass flow rate distribution inside the high temperature reheater (HTR) tube panels, the ash-side heat transfer coefficient distribution along the ash movement direction inside the FBHE was obtained in this paper. A cell model with energy and material balances was also developed for the FBHE. The measured and calculated results indicate that the post-combustion phenomenon exists in the FBHE. The ash-flow movement inside the FBHE has an important impact on the bed-to-tube heat transferring process. Specifically, along the ash moving direction, steam temperature at the outlet of corresponding tube panel decreases gradually, as well as the local ash-side heat transfer coefficient. These results can provide referential materials for design and operation of the FBHE in large-scale CFB boilers.
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Journal: Applied Thermal Engineering - Volume 81, 25 April 2015, Pages 262–270